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Update font_manager to only use registry on Win #24655

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Merged
merged 4 commits into from
Jan 11, 2023
Merged

Update font_manager to only use registry on Win #24655

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b3d1828
Update font_manager to only use registry on Win
almarklein Dec 7, 2022
f1beb1d
TST: xfail the windows font test
tacaswell Jan 5, 2023
17fac2e
DOC: add behavior change note for only considering fonts in registry
tacaswell Jan 5, 2023
dfec6b3
DOC: fix english and cross ref
tacaswell Jan 6, 2023
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15 changes: 15 additions & 0 deletions doc/api/next_api_changes/behavior/24655-AK.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
On Windows only fonts known to the registry will be discovered
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Previously, Matplotlib would recursively walk user and system font directories
to discover fonts, however this lead to a number of undesirable behaviors
including finding deleted fonts. Now Matplotlib will only find fonts that are
known to the Windows registry.

This means that any user installed fonts must go through the Windows font
installer rather than simply being copied to the correct folder.

This only impacts the set of fonts Matplotlib will consider when using
`matplotlib.font_manager.findfont`. To use an arbitrary font, directly pass the
path to a font as shown in
:doc:`/gallery/text_labels_and_annotations/font_file`.
17 changes: 6 additions & 11 deletions lib/matplotlib/font_manager.py
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Expand Up @@ -186,16 +186,11 @@ def list_fonts(directory, extensions):
recursively under the directory.
"""
extensions = ["." + ext for ext in extensions]
if sys.platform == 'win32' and directory == win32FontDirectory():
return [os.path.join(directory, filename)
for filename in os.listdir(directory)
if os.path.isfile(os.path.join(directory, filename))]
else:
return [os.path.join(dirpath, filename)
# os.walk ignores access errors, unlike Path.glob.
for dirpath, _, filenames in os.walk(directory)
for filename in filenames
if Path(filename).suffix.lower() in extensions]
return [os.path.join(dirpath, filename)
# os.walk ignores access errors, unlike Path.glob.
for dirpath, _, filenames in os.walk(directory)
for filename in filenames
if Path(filename).suffix.lower() in extensions]


def win32FontDirectory():
Expand Down Expand Up @@ -275,7 +270,7 @@ def findSystemFonts(fontpaths=None, fontext='ttf'):
if fontpaths is None:
if sys.platform == 'win32':
installed_fonts = _get_win32_installed_fonts()
fontpaths = MSUserFontDirectories + [win32FontDirectory()]
fontpaths = []
else:
installed_fonts = _get_fontconfig_fonts()
if sys.platform == 'darwin':
Expand Down
2 changes: 1 addition & 1 deletion lib/matplotlib/tests/test_font_manager.py
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Expand Up @@ -200,7 +200,7 @@ def test_user_fonts_win32():
pytest.xfail("This test should only run on CI (appveyor or azure) "
"as the developer's font directory should remain "
"unchanged.")

pytest.xfail("We need to update the registry for this test to work")
font_test_file = 'mpltest.ttf'

# Precondition: the test font should not be available
Expand Down